Readynas RNDU2000 not accesible in Windows10-64

Greetings

I have a Netgear NAS type Readynas RNDU2000.

I need to use this back-up NAS again, that has not been used for a few years.
Now I receive all kind of errors and cannot access files unless I use an old XP-computer. 

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Win10-64 computer:
Choosing "setup" in Raidar, gives:
"Deze site kan geen beveiligde verbinding leveren
192.168.1.201 gebruikt een niet-ondersteund protocol.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH"
meaning:

"This site cannot give a secured connection.
.... uses a unsupported protocol.
ERR_SSL_VERSION_OR_CIPHER_MISMATCH".

Choosing "browse" in Raidar, gives:
..... This share uses out dated SMB1 protocol that is unsafe ... blahblah
... your system needs SMB2 or higher.

Gowing to the web interface, I only see "momentarely  no shares available".

No menus, no wizard. Only menu options are "shares" and "Password" and "Log out".

Using explorer to set up a network path to the NAS, I get:

..... This share uses out dated SMB1 protocol that is unsafe ... blahblah
... your system needs SMB2 or higher.

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XP-computer: (Radiator 4.2.31)
Logging in on web-interface works fine, menus are complete and working.
Files on NAS are accesible, so shares are present and working.

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Is there a way to update the NAS firmware?
Or to fix the WIN10-64 problem?
I hope you have a solution.

Kind regards,
Henk